Not 100% sure but there was some news a few years back about miners setting up shop in towns which had really low energy costs because they bought a fixed block

Not 100% sure but there was some news a few years back about miners setting up shop in towns which had really low energy costs because they bought a fixed block of power from a nearby source and thus it was super cheap... as long as they didn't have to go over that initial purchase, after that it became more expensive than normal for everyone.